It allows you to combine WhatsApp and all the mainstream messengers into one simple window!
Multi messenger is a wrapper for WhatsApp Web and other worldwide messengers. It allows you to have access to the official services quickly from a standalone sandboxed window.
Multiple Instances :
You can even use multiple messenger e.g. WhatsApp, Messenger or Telegram, which makes it the perfect tool to manage multiple social accounts all at the same time.
Note: Multi messenger does NOT belong or relate to the official WhatsApp application or other messengers. It is an unofficial Extension that is developed and maintained independently with the sole purpose of making these services easier to be accessed.